4.7 Article

Solution-synthesis of Sb2Se3 nanorods using KSeCN as a molecular selenium source

Journal

CRYSTENGCOMM
Volume 22, Issue 1, Pages 68-73

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ce01399g

Keywords

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Funding

  1. NSFC [21571086, 21201086]
  2. China Postdoctoral Science Foundation [2014M550267, 2015T80501]
  3. Natural Science Foundation of Jiangsu Province [BK20141297]

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Antimony selenide (Sb2Se3) is a low-toxic, element-abundant, narrow bandgap (E-g = similar to 1.1-1.3 eV) semiconductor that shows potential for UV-Visible-Near-infrared optoelectronic applications. This paper reports the use of potassium selenocyanate (KSeCN) as a novel molecular selenium source to synthesize Sb2Se3 uniform nanorods. The resulting nanorods have been carefully characterized and are found to exhibit decent photoconductivity as well as broad-spectrum optical absorption with an E-g value of similar to 1.35 eV. A molecular reaction mechanism is rationally proposed and evidenced for forming Sb2Se3, which is related to the thermal decomposition of selenocyanate (SeCN-) anions through the cleaving of Se-CN bonds to elemental Se(0), followed by its reduction to Se2- anions. Our work using KSeCN offers an alternative method for the synthesis of metal selenides with desirable nanostructures and properties.

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